convert c++ to java code below#ifndef TK_SPLINE_H#define TK_SPLINE_H#include cstdio#include cassert#include vector#include algorithm unnamed namespace only because the implementation is in this header

Here is the converted Java code:

import java.util.ArrayList;
import java.util.List;

class BandMatrix {
    private List<List<Double>> upper;
    private List<List<Double>> lower;
    
    public BandMatrix() {}
    
    public BandMatrix(int dim, int n_u, int n_l) {
        resize(dim, n_u, n_l);
    }
    
    public void resize(int dim, int n_u, int n_l) {
        assert dim > 0;
        assert n_u >= 0;
        assert n_l >= 0;
        
        upper = new ArrayList<>(n_u + 1);
        lower = new ArrayList<>(n_l + 1);
        
        for (int i = 0; i < n_u +